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| author | Craig Topper <craig.topper@gmail.com> | 2020-02-07 21:33:39 -0800 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2020-02-07 22:25:56 -0800 |
| commit | 2af1640f9aa4ebe5d447586bbdad6514312bb814 (patch) | |
| tree | 550fff7e17fb66304209ca8c7977c2db3a66767b /clang/lib/Frontend/CompilerInvocation.cpp | |
| parent | 4dcc029edbe4bd5e30d4f0cdcf123ea4ed2b6418 (diff) | |
| download | llvm-2af1640f9aa4ebe5d447586bbdad6514312bb814.zip llvm-2af1640f9aa4ebe5d447586bbdad6514312bb814.tar.gz llvm-2af1640f9aa4ebe5d447586bbdad6514312bb814.tar.bz2 | |
[LegalizeDAG][X86][AMDGPU] Use ANY_EXTEND instead of ZERO_EXTEND when promoting ISD::CTTZ/CTTZ_ZERO_UNDEF.
Summary:
For CTTZ we place a set bit just past where the non-promoted type
stopped so the extended bits won't be used for the count. For
CTTZ_ZERO_UNDEF we don't care what happens if no bits are set in
the original type and we end up counting into the extended bits.
So we can just use ANY_EXTEND for both cases.
This matches what is done in type legalization for these operations.
We make no effort to force the upper bits to zero.
Differential Revision: https://reviews.llvm.org/D74111
Diffstat (limited to 'clang/lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions